    <SEC-DOCUMENT>0001193125-16-639643-index.html : 20160701
    <SEC-HEADER>0001193125-16-639643.hdr.sgml : 20160701
    <ACCEPTANCE-DATETIME>20160701110624
    ACCESSION NUMBER:		0001193125-16-639643
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		22
    CONFORMED PERIOD OF REPORT:	20160430
    FILED AS OF DATE:		20160701
    DATE AS OF CHANGE:		20160701
    EFFECTIVENESS DATE:		20160701

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIVEST FUND II, INC.
    		CENTRAL INDEX KEY:			0000897269
    		IRS NUMBER:				223220659
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07478
    		FILM NUMBER:		161745386

    	BUSINESS ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    		BUSINESS PHONE:		800-441-7762

    	MAIL ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK MUNIVEST FUND II INC
    		DATE OF NAME CHANGE:	20061026

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIVEST FUND II INC
    		DATE OF NAME CHANGE:	19930714
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d168619dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIVEST FUND II, INC.
    <TEXT>
    Document 1 - file: d168619dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d168619dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d168619dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d168619dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d168619dex99906cert.htm

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    <TYPE>EX-99.PROXY.POL
    <SEQUENCE>4
    <FILENAME>d168619dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
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    Document 4 - file: d168619dex99proxypol.htm

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    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE AND ENGAGEMENT PRINCIPLES
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    Document 5 - file: d168619dex99corpgov.htm

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    <DESCRIPTION>GRAPHIC
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    Document 8 - file: g172854logo.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 9 - file: g172854snap8.jpg

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    Document 10 - file: g175853photo_01mips.jpg

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    Document 11 - file: g175853sig_01mips.jpg

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    Document 12 - file: g176358g09g62.jpg

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    Document 13 - file: g176358g09h65.jpg

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    Document 14 - file: g176358g41l68.jpg

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    Document 15 - file: g176358g44u23.jpg

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    Document 16 - file: g176358g51n99.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 17 - file: g176358g60p62.jpg

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    Document 19 - file: g176358g65b16.jpg

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    Document 20 - file: g176358g83y23.jpg

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    Document 21 - file: g176358g98u13.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 22 - file: g176358leaf.jpg

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